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See REX640 Hardware modification instructions (1MRS759101) for the required tools and other information related to the modification. The document is included in the delivery.
DANGER: Disconnect the relay's auxiliary voltage and carry out modifications on a de-energized feeder.Note: Check the printed documentation included in the modification package delivery. Follow in detail the Relay module modification table in the Modified Product document.
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Replace the existing product labels with the new ones (two copies) included in the delivery.
Note: If the delivery contains material for the modification of several relays, check the correct label based on the serial number of each relay under modification.